EP1927375B1 - A catheter steering system - Google Patents

A catheter steering system Download PDF

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Publication number
EP1927375B1
EP1927375B1 EP07254554A EP07254554A EP1927375B1 EP 1927375 B1 EP1927375 B1 EP 1927375B1 EP 07254554 A EP07254554 A EP 07254554A EP 07254554 A EP07254554 A EP 07254554A EP 1927375 B1 EP1927375 B1 EP 1927375B1
Authority
EP
European Patent Office
Prior art keywords
tubular member
actuator
region
cutaway portion
distal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP07254554A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1927375A2 (en
EP1927375A3 (en
Inventor
Matthew Partlett
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cathrx Ltd
Original Assignee
Cathrx Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cathrx Ltd filed Critical Cathrx Ltd
Publication of EP1927375A2 publication Critical patent/EP1927375A2/en
Publication of EP1927375A3 publication Critical patent/EP1927375A3/en
Application granted granted Critical
Publication of EP1927375B1 publication Critical patent/EP1927375B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/0105—Steering means as part of the catheter or advancing means; Markers for positioning
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/0105—Steering means as part of the catheter or advancing means; Markers for positioning
    • A61M25/0133—Tip steering devices
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/0105—Steering means as part of the catheter or advancing means; Markers for positioning
    • A61M25/0133—Tip steering devices
    • A61M25/0138—Tip steering devices having flexible regions as a result of weakened outer material, e.g. slots, slits, cuts, joints or coils

Definitions

  • This invention relates, generally, to a catheter steering system and, more particularly, to a catheter steering mechanism and to a steerable catheter including the steering mechanism.
  • Such a catheter steering mechanism is disclosed for example in US 2006/0184105 .
  • Electrophysiology catheters are medical devices used for measuring electrical signals within the heart and are often used in the diagnosis of various arrhythmias. Certain types of these catheters may also be used for treating arrhythmias through ablative techniques.
  • the catheter is inserted through the femoral vein of the patient.
  • the tip of the catheter is steered through the vascular system of the patient to the desired location.
  • the catheter tip is steered through the ventricles of the heart to arrive at the desired location.
  • Steerable catheters have, in the past, made use of a metal strip or shim contained within the distal end of the catheter as a portion of a steering device.
  • One or more pull wires are connected to the metal strip. Manipulation of these pull wires causes the metal strip to bend to deflect the distal end of the catheter.
  • a catheter lumen often contains a steering device along with other elements such as electrical conductors. Therefore, space within the lumen is at a premium.
  • US Patent Publication No. 2002/0082584 to Rosenman et al discloses drug delivery catheter system comprising a steerable guide catheter and a drug delivery catheter.
  • the steerable guide catheter has a pair of extension tubes defining a shoulder with the drug delivery catheter having a docking segments receivable in the tubes.
  • the guide catheter receives the drug delivery catheter after the guide catheter has been inserted into a patient's body. Once the delivery catheter has been inserted, it can be rotated to attach a helical tip of the delivery catheter to the target site.
  • the guide catheter includes a steering mechanism and a friction mechanism which controls the tension on the steering mechanism.
  • a catheter steering mechanism including:
  • the predetermined location of the bend-enhancing region is that part of the tubular member at which it is desired that bending is to occur.
  • the cutaway portion may subtend an angle greater than 180° of a wall of the tubular member to retain a longitudinally extending web or spine of material of the tubular member.
  • the cutaway portion may subtend a greater angle at a distal region of the cutaway portion than at a proximal region of the cutaway portion.
  • the actuator may have a region of reduced cross-section coincident with the bend enhancing region of the tubular member.
  • the region of reduced cross-section may be defined by a cutaway portion of the actuator, the cutaway portion subtending an angle greater than 180° to retain a longitudinally extending web or spine of material of the actuator of a required final width.
  • the spine of the actuator When the actuator is received in the passage of the tubular member, the spine of the actuator may lie adjacent and in register with the spine of the tubular member.
  • the cutaway portion of the actuator may subtend a greater angle at a distal region of the cutaway portion than at a proximal region of the cutaway portion.
  • the cutaway portion of the actuator may have radiused proximal and distal transition regions for stress relief purposes.
  • the proximal transition region may have a greater radius than the distal transition region.
  • the actuator is a rod.
  • the term "rod” is to be understood in broad sense to include a wire, multi-strand cable, or the like.
  • the restraining arrangement may comprise a cage structure arranged at the bend enhancing region of the tubular member.
  • the cage structure may comprise a plurality of spaced hoops arranged at longitudinally spaced intervals along the tubular member. Hoops may be arranged along the entire length of the bend enhancing region of the tubular member effectively to "fill" in the bend enhancing region apart from the gaps between the hoops.
  • the term "hoop” is to be understood as a substantially U-shaped element, i.e. not an endless element.
  • a length of each hoop may be greater than a spacing between adjacent hoops.
  • the "length" of the hoop is its dimension parallel to a longitudinal axis of the tubular member.
  • the tubular member and the actuator may be of a superlastic material such as a nickel-titanium alloy material.
  • the actuator may be secured to a distal end of the tubular member at an attachment point with a part of the actuator extending distally of the attachment point.
  • the part of the actuator extending distally of the attachment point may be shaped into a predetermined shape distally of the attachment point.
  • a part of the tubular member may extend distally of the attachment point, the part of the tubular member extending distally of the attachment point being shaped into a predetermined shape distally of the attachment point.
  • a protective arrangement may be received over the tubular member to inhibit the ingress of foreign material into the tubular member.
  • the protective arrangement may comprise a protective sheath received over the tubular member.
  • the protective sheath may be a sleeve of a heat shrink material.
  • reference numeral 10 generally designates a catheter steering mechanism in accordance with an embodiment of the invention.
  • the catheter steering mechanism includes a tubular member 12 defining a passage 14.
  • the tubular member 12 has a longitudinally extending cutaway portion 16 proximally of its distal end 18.
  • the cutaway portion 16 defines a bend enhancing region in the tubular member 12.
  • An elongate actuator 20 is received within the passage 14 of the tubular member 12.
  • a distal end 22 of the actuator 20 is fast with the distal end 18 of the tubular member 12.
  • a restraining arrangement 24 is defined by the tubular member 12.
  • the restraining arrangement 24 comprises a cage structure 26 arranged at the bend enhancing region 16 of the tubular member 12.
  • the actuator 20 is a solid actuator but those skilled in the art will readily appreciate that the actuator could also be tubular.
  • Both the tubular member 12 and the actuator 20 of the steering mechanism 10 are formed of a suitable resiliently flexible material such as, for example, a superlastic material such as Nitinol.
  • the tubular member 12 is described in greater detail. It is to be noted that the cage structure 26 comprises a plurality of longitudinally spaced hoops 28. The hoops 28 serve to constrain the actuator 20 within the confines of the tubular member 12 in the region of the cutaway portion 16 during bending of the tubular member 12.
  • the cutaway portion 16 subtends an angle exceeding 180°.
  • the spine 30 tapers towards the distal end of the bending enhancing region so that less material is present in the spine 30 at the distal end than at the proximal end of the spine 30.
  • a thickness T p at the proximal end of the spine 30 is greater than a thickness T d at the distal end of the spine 30.
  • the tubular member 12 may have an outer diameter of approximately 0.66 mm and an inner diameter of about 0.51 mm.
  • the proximal thickness T p of the spine 30 is about 0.25 mm while the distal thickness T d of the spine 30 is about 0.15 mm.
  • the spine 30 has a radiused proximal transition 32 and a radiused distal transition 34 for stress relief purposes.
  • the proximal transition 32 is longer than the distal transition 34 as a result of the proximal transition 32 having a greater radius than the distal transition 34.
  • the proximal transition 32 is approximately 10 mm in length with the distal transition 34 having a length of approximately half of that, i.e. about 5 mm.
  • proximal transition 32 the distal transition 34
  • the actuator 20 is formed of a machined Nitinol wire having an outer diameter of about 0.47 mm to fit within the passage 14 of the tubular member 12. A part of the actuator 20 is shown in greater detail in Figs. 5 and 6 of the drawings.
  • the actuator 20 has a cutaway portion 36 defining a spine 38 of material. In use, the actuator 20 is inserted into the passage 14 of the tubular member 12 with the spine 38 of the actuator 20 being in register, and coincident, with the spine 30 of the tubular member 12.
  • the spine 38 of the actuator 20 has a proximal transition region 40 and a distal transition region 42.
  • the proximal transition region 40 has a larger radius than the distal transition region 42.
  • the proximal transition region 40 may have a length of approximately 10 mm with the distal transition region 42 having a length of approximately half of that, i.e. about 5 mm.
  • the spine 30 has a proximal thickness which is greater than the distal thickness.
  • the proximal thickness of the spine 38 is, for example, about 0.22 mm while the distal thickness is about 0.16 mm. This, once again, improves the uniformity of bending of the steering mechanism 10.
  • the cage structure 26 of the restraining arrangement 24 is, as described above, made up of the longitudinally spaced hoops 28.
  • the hoops 28 have a longitudinal length, L, exceeding that of the spacing between adjacent hoops 28. It will, however, be appreciated that this need not be the case and the spacing between the hoops 28 could be the same as, or greater than, the length, L, of the hoops 28 so long as the actuator 20 is constrained within the tubular member 12 at the region of the cutaway portion 16 during bending of the steering mechanism 10.
  • the restraining arrangement 24 is formed by laser cutting slots between the hoops 28 into the wall of the tubular member 12. This also forms the bend-enhancing region of the tubular member 12. Similarly, the cutaway portion 36 of the actuator 20 is formed by laser cutting.
  • the actuator 20 is inserted into the passage 14 of the tubular member 12 and the distal end 18 of the tubular member 12 is secured to the distal end 22 of the tubular member 12, for example, by crimping, welding, or the like.
  • a proximal end (not shown) of the tubular member 12 is fixed in position in a catheter handle and a proximal end 44 ( Fig. 1 ) of the actuator 20 is longitudinally displaceably secured within the catheter handle to be displaceable in the direction of arrows 46 and 48.
  • the actuator 20 could be anchored and the tubular member 12 is then displaceably arranged relative to the actuator 20. What is required is relative longitudinal displacement between the tubular member 12 and the actuator 20.
  • the steering mechanism 10 bends in the direction of arrow 50. Conversely, when the actuator 20 is pulled in the direction of arrow 48 relative to the tubular member 12, the steering mechanism 10 bends in the direction of arrow 52.
  • a protective sheath 54 is, for example, a sleeve of a heat shrink material.
  • the actuator 20 is constrained within the tubular member 12 in the bend-enhancing region of the steering mechanism 10.
  • the hoops 28 serve to provide this restraint.
  • the hoops 28 are so arranged that the bending of the steering mechanism 12 in the region of the bend-enhancing region 16 is not adversely affected.
  • the use of the restraining arrangement 24 improves the strength and durability of the steering mechanism 10 resulting in less likelihood of mechanical failure of the steering mechanism 10 in the bend-enhancing region of the tubular member 12.
EP07254554A 2006-11-28 2007-11-22 A catheter steering system Active EP1927375B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US86164206P 2006-11-28 2006-11-28

Publications (3)

Publication Number Publication Date
EP1927375A2 EP1927375A2 (en) 2008-06-04
EP1927375A3 EP1927375A3 (en) 2008-08-27
EP1927375B1 true EP1927375B1 (en) 2010-06-23

Family

ID=39200875

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07254554A Active EP1927375B1 (en) 2006-11-28 2007-11-22 A catheter steering system

Country Status (10)

Country Link
US (1) US8251977B2 (ja)
EP (1) EP1927375B1 (ja)
JP (1) JP4990102B2 (ja)
CN (1) CN101259014A (ja)
AT (1) ATE471736T1 (ja)
AU (1) AU2007231733B2 (ja)
CA (1) CA2609478A1 (ja)
DE (1) DE602007007280D1 (ja)
ES (1) ES2346010T3 (ja)
NZ (1) NZ562976A (ja)

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US8961550B2 (en) 2012-04-17 2015-02-24 Indian Wells Medical, Inc. Steerable endoluminal punch

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US20100298832A1 (en) 2009-05-20 2010-11-25 Osseon Therapeutics, Inc. Steerable curvable vertebroplasty drill
CN102481433B (zh) * 2009-06-24 2014-12-31 施菲姆德控股有限责任公司 可转向医疗输送装置
AU2015210338B2 (en) * 2009-06-24 2018-02-01 Shifamed Holdings, Llc Steerable medical delivery devices and methods of use
US9084610B2 (en) 2010-10-21 2015-07-21 Medtronic Ardian Luxembourg S.A.R.L. Catheter apparatuses, systems, and methods for renal neuromodulation
EP2632376B1 (en) 2010-10-25 2020-02-12 Medtronic Ardian Luxembourg S.à.r.l. Catheter apparatuses having multi-electrode arrays for renal neuromodulation
US20120209375A1 (en) * 2011-02-11 2012-08-16 Gilbert Madrid Stability device for use with percutaneous delivery systems
WO2012151396A2 (en) 2011-05-03 2012-11-08 Shifamed Holdings, Llc Steerable delivery sheaths
US8888773B2 (en) 2012-05-11 2014-11-18 Medtronic Ardian Luxembourg S.A.R.L. Multi-electrode catheter assemblies for renal neuromodulation and associated systems and methods
US9044575B2 (en) 2012-10-22 2015-06-02 Medtronic Adrian Luxembourg S.a.r.l. Catheters with enhanced flexibility and associated devices, systems, and methods
US9339271B2 (en) 2013-03-14 2016-05-17 C.R. Bard, Inc. Articulating surgical instruments
EP2996754B1 (en) 2013-05-18 2023-04-26 Medtronic Ardian Luxembourg S.à.r.l. Neuromodulation catheters with shafts for enhanced flexibility and control and associated devices and systems
WO2014194368A1 (en) 2013-06-07 2014-12-11 Cathrx Ltd An electrical lead for a catheter and method of manufacturing
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US10736690B2 (en) 2014-04-24 2020-08-11 Medtronic Ardian Luxembourg S.A.R.L. Neuromodulation catheters and associated systems and methods
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US11833034B2 (en) 2016-01-13 2023-12-05 Shifamed Holdings, Llc Prosthetic cardiac valve devices, systems, and methods
CN107837105B (zh) * 2016-09-18 2020-09-01 先健科技(深圳)有限公司 穿刺导管及组织紧缩系统
CN109862834B (zh) 2016-10-27 2022-05-24 Dfine有限公司 具有接合剂递送通道的可弯曲的骨凿
TWI767960B (zh) * 2016-11-25 2022-06-21 日商住友電木股份有限公司 醫療設備
JP7256119B2 (ja) 2016-11-28 2023-04-11 ディファイン インコーポレイテッド 腫瘍切除装置及び関連する方法
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Also Published As

Publication number Publication date
JP4990102B2 (ja) 2012-08-01
EP1927375A2 (en) 2008-06-04
EP1927375A3 (en) 2008-08-27
US20080140053A1 (en) 2008-06-12
ES2346010T3 (es) 2010-10-07
CN101259014A (zh) 2008-09-10
US8251977B2 (en) 2012-08-28
DE602007007280D1 (de) 2010-08-05
AU2007231733A1 (en) 2009-05-14
JP2008132332A (ja) 2008-06-12
NZ562976A (en) 2009-03-31
ATE471736T1 (de) 2010-07-15
AU2007231733B2 (en) 2014-03-13
CA2609478A1 (en) 2008-05-28

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